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        <h1 id="原生js实现电商商品图片放大镜效果"><a href="#原生js实现电商商品图片放大镜效果" class="headerlink" title="原生js实现电商商品图片放大镜效果"></a>原生js实现电商商品图片放大镜效果</h1><h2 id="相信大家逛淘宝，京东等类似电商购物平台的时候往往会看到一些图片展示的效果，例如：把鼠标放在图片上右侧会出现一个放大的预览区域，这就是所谓放大镜效果，今天就教大家用js写一个类似放大镜效果。"><a href="#相信大家逛淘宝，京东等类似电商购物平台的时候往往会看到一些图片展示的效果，例如：把鼠标放在图片上右侧会出现一个放大的预览区域，这就是所谓放大镜效果，今天就教大家用js写一个类似放大镜效果。" class="headerlink" title="相信大家逛淘宝，京东等类似电商购物平台的时候往往会看到一些图片展示的效果，例如：把鼠标放在图片上右侧会出现一个放大的预览区域，这就是所谓放大镜效果，今天就教大家用js写一个类似放大镜效果。"></a>相信大家逛淘宝，京东等类似电商购物平台的时候往往会看到一些图片展示的效果，例如：把鼠标放在图片上右侧会出现一个放大的预览区域，这就是所谓放大镜效果，今天就教大家用js写一个类似放大镜效果。</h2><p><strong>需求分析</strong>鼠标移动到商品区域黄块区显示，同时右边的商品大图显示。</p>
<ol>
<li><p>鼠标移动到商品区域黄块区显示，同时右边的商品大图显示。</p>
</li>
<li><p>黄块区随着鼠标的移动而移动并且商品大图也对应移动。</p>
</li>
<li><p>当鼠标移出黄块消失商品大图也消失。</p>
</li>
</ol>
<p><strong>思路</strong></p>
<ul>
<li><p>把需求拆成两部分来做</p>
</li>
<li><p>实现mask的移动</p>
</li>
<li><p>实现商品图片对应的移动</p>
</li>
</ul>
<h3 id="实现mask的移动"><a href="#实现mask的移动" class="headerlink" title="实现mask的移动"></a>实现mask的移动</h3><ol>
<li><p>用maskX和maskY来记录mask的横纵坐标</p>
</li>
<li><p>maskX(Y)的限制条件</p>
</li>
</ol>
<ul>
<li><p>maskX(Y)实现正中间:<code>maskX = maskX - mask.offsetHeight / 2; maskY = maskY - mask.offsetWidth / 2</code></p>
</li>
<li><p>maskX(Y)实现限制其上下左右的出范围移动:<code>maskX = maskX &gt; screen.offsetWidth - mask.offsetWidth ? screen.offsetWidth - mask .offsetWidth : maskX; maskY = maskY &gt; screen.offsetHeight - mask.offsetHeight ? screen.offsetHeight - mask .offsetHeight : maskY;</code>(不懂三目表达式的自行<a href="https://www.baidu.com/" target="_blank" rel="noopener">百度</a>)</p>
</li>
</ul>
<p>实现商品图片对应移动</p>
<p>商品移动要随着黄块的移动而移动，两者必然存在每种联系。黄块在的移动左边图片上的移动和右侧大图在右侧显示区的移动比例是相等的。</p>
<blockquote>
<p>So =&gt;<strong><code>mask移动的距离 / mask最大能够移动的距离 = 大图片移动的距离 / 大图片最大能够移动的距离</code></strong></p>
</blockquote>
<p>这下就好办多了<br>mask移动的距离,mask最大能够移动的距离,大图片最大能够移动的距离都是已知的，那么大图片移动的距离是可以求出来的</p>
<hr>
<h1 id="show-the-code"><a href="#show-the-code" class="headerlink" title="show the code"></a>show the code</h1><h2 id="html"><a href="#html" class="headerlink" title="html"></a>html</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">&lt;div id=&quot;screen&quot;&gt;</span><br><span class="line">       &lt;div class=&quot;smallImg&quot;&gt;</span><br><span class="line">           &lt;img src=&quot;19.jpg&quot; alt=&quot;small&quot;&gt;</span><br><span class="line">           &lt;div class=&quot;mask&quot;&gt;&lt;/div&gt;</span><br><span class="line">       &lt;/div&gt;</span><br><span class="line">       &lt;div class=&quot;bigImg&quot;&gt;</span><br><span class="line">           &lt;img src=&quot;19.jpg&quot; alt=&quot;bigImg&quot;&gt;</span><br><span class="line">       &lt;/div&gt;</span><br><span class="line">&lt;/div&gt;</span><br></pre></td></tr></table></figure>
<h2 id="css"><a href="#css" class="headerlink" title="css"></a>css</h2><figure class="highlight css"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line">* &#123;</span><br><span class="line">       <span class="attribute">margin</span>: <span class="number">0</span>;</span><br><span class="line">       <span class="attribute">padding</span>: <span class="number">0</span>;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   <span class="selector-id">#screen</span> &#123;</span><br><span class="line">       <span class="attribute">height</span>: <span class="number">400px</span>;</span><br><span class="line">       <span class="attribute">width</span>: <span class="number">400PX</span>;</span><br><span class="line">       <span class="attribute">margin</span>: <span class="number">60px</span> auto;</span><br><span class="line">       <span class="attribute">position</span>: relative;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   <span class="selector-id">#screen</span>&gt;<span class="selector-tag">div</span> &#123;</span><br><span class="line">       <span class="attribute">position</span>: absolute;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   <span class="selector-class">.smallImg</span> &#123;</span><br><span class="line">       <span class="attribute">width</span>: <span class="number">400px</span>;</span><br><span class="line">       <span class="attribute">height</span>: <span class="number">400px</span>;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   <span class="selector-class">.smallImg</span> <span class="selector-tag">img</span> &#123;</span><br><span class="line">       <span class="attribute">width</span>: <span class="number">100%</span>;</span><br><span class="line">       <span class="attribute">height</span>: <span class="number">100%</span>;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   <span class="selector-class">.mask</span> &#123;</span><br><span class="line">       <span class="attribute">position</span>: absolute;</span><br><span class="line">       <span class="attribute">width</span>: <span class="number">100px</span>;</span><br><span class="line">       <span class="attribute">height</span>: <span class="number">100px</span>;</span><br><span class="line">       <span class="attribute">top</span>: <span class="number">0</span>;</span><br><span class="line">       <span class="attribute">left</span>: <span class="number">0</span>;</span><br><span class="line">       <span class="attribute">background</span>: <span class="built_in">rgba</span>(255, 255, 0, 0.4);</span><br><span class="line">       <span class="attribute">display</span>: none;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   <span class="selector-class">.bigImg</span> &#123;</span><br><span class="line">       <span class="attribute">width</span>: <span class="number">400px</span>;</span><br><span class="line">       <span class="attribute">height</span>: <span class="number">400px</span>;</span><br><span class="line">       <span class="attribute">margin-left</span>: <span class="number">420px</span>;</span><br><span class="line">       <span class="attribute">overflow</span>: hidden;</span><br><span class="line">       <span class="attribute">display</span>: none;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   <span class="selector-class">.bigImg</span> <span class="selector-tag">img</span> &#123;</span><br><span class="line">       <span class="attribute">width</span>: <span class="number">1600px</span>;</span><br><span class="line">       <span class="attribute">height</span>: <span class="number">1600px</span>;</span><br><span class="line">       <span class="attribute">position</span>: absolute;</span><br><span class="line">   &#125;</span><br></pre></td></tr></table></figure>
<h2 id="JavaScript"><a href="#JavaScript" class="headerlink" title="JavaScript"></a>JavaScript</h2><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">window</span>.onload = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">       <span class="comment">// 选取元素</span></span><br><span class="line">       <span class="keyword">let</span> mask = <span class="built_in">document</span>.querySelectorAll(<span class="string">'.mask'</span>)[<span class="number">0</span>];</span><br><span class="line">       <span class="keyword">let</span> screen = <span class="built_in">document</span>.getElementById(<span class="string">'screen'</span>);</span><br><span class="line">       <span class="keyword">let</span> smallImg = screen.children[<span class="number">0</span>];</span><br><span class="line">       <span class="keyword">let</span> bigImg = screen.children[<span class="number">1</span>];</span><br><span class="line">       <span class="keyword">let</span> bigImage = bigImg.children[<span class="number">0</span>];</span><br><span class="line"></span><br><span class="line">       screen.addEventListener(<span class="string">'mouseover'</span>, <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">           mask.style.display = <span class="string">'block'</span>;</span><br><span class="line">           bigImg.style.display = <span class="string">'block'</span>;</span><br><span class="line">       &#125;)</span><br><span class="line"></span><br><span class="line">       screen.addEventListener(<span class="string">'mouseout'</span>, <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">           mask.style.display = <span class="string">'none'</span>;</span><br><span class="line">           bigImg.style.display = <span class="string">'none'</span>;</span><br><span class="line">       &#125;)</span><br><span class="line">       screen.addEventListener(<span class="string">'mousemove'</span>, <span class="function"><span class="keyword">function</span> (<span class="params">ev</span>) </span>&#123;</span><br><span class="line">           <span class="keyword">let</span> e = ev || event;</span><br><span class="line"></span><br><span class="line">           <span class="comment">//记录下鼠标移动时候mask的横纵坐标</span></span><br><span class="line">           <span class="keyword">let</span> maskX = e.pageX - screen.offsetLeft;</span><br><span class="line">           <span class="keyword">let</span> maskY = e.pageY - screen.offsetTop;</span><br><span class="line">           maskX = maskX - mask.offsetHeight / <span class="number">2</span>;</span><br><span class="line">           maskY = maskY - mask.offsetWidth / <span class="number">2</span>;</span><br><span class="line"></span><br><span class="line">           <span class="comment">//限制条件</span></span><br><span class="line">           maskX = maskX &lt; <span class="number">0</span> ? <span class="number">0</span> : maskX;</span><br><span class="line">           maskY = maskY &lt; <span class="number">0</span> ? <span class="number">0</span> : maskY;</span><br><span class="line">           maskX = maskX &gt; screen.offsetWidth - mask.offsetWidth ? screen.offsetWidth - mask</span><br><span class="line">               .offsetWidth : maskX;</span><br><span class="line">           maskY = maskY &gt; screen.offsetHeight - mask.offsetHeight ? screen.offsetHeight - mask</span><br><span class="line">               .offsetHeight :</span><br><span class="line">               maskY;</span><br><span class="line"></span><br><span class="line">           mask.style.left = maskX + <span class="string">'px'</span>;</span><br><span class="line">           mask.style.top = maskY + <span class="string">'px'</span>;</span><br><span class="line"></span><br><span class="line">           <span class="comment">// mask移动的距离 / mask最大能够移动的距离  = 大图片移动的距离 / 大图片最大能够移动的距离</span></span><br><span class="line">           <span class="keyword">let</span> maskMax = screen.offsetWidth - mask.offsetWidth; </span><br><span class="line"></span><br><span class="line">           <span class="keyword">let</span> bigImageMax = bigImage.offsetWidth - bigImg.offsetWidth; </span><br><span class="line"></span><br><span class="line">           <span class="keyword">let</span> bigImageX = maskX * bigImageMax / maskMax; </span><br><span class="line"></span><br><span class="line">           <span class="keyword">let</span> bigImageY = maskY * bigImageMax / maskMax; </span><br><span class="line">           bigImage.style.left = -bigImageX + <span class="string">'px'</span>;</span><br><span class="line">           bigImage.style.top = -bigImageY + <span class="string">'px'</span>;</span><br><span class="line">       &#125;)</span><br><span class="line"></span><br><span class="line">   &#125;</span><br></pre></td></tr></table></figure>
<blockquote>
<p><img src="https://cdn.sinaimg.cn.52ecy.cn/large/005BYqpgly1g3xjzfbnz1j3073073dfr.jpg" alt="5cff8a8605bf674705"></p>
</blockquote>
<p>效果如下</p>
<blockquote>
<p><img src="https://cdn.sinaimg.cn.52ecy.cn/large/005BYqpgly1g3xk07w3jtg30ow0dcu0x.jpg" alt="效果图"></p>
</blockquote>
<hr>
<p>Δ~~~~Δ<br> ξ •ェ• ξ<br> ξ　~　ξ<br> ξ　　 ξ<br> ξ　　　“~～~～〇<br> ξ　　　　　　 ξ<br> ξ　ξ　ξ~～~ξ　ξ<br> 　ξ_ξξ<em>ξ　ξ</em>ξξ_ξ<br> 　　ヽ(´•ω•)ノ<br> 　　　 |　 /<br> 　　　 UU”</p>
<blockquote>
<p>本文结束谢谢大家的阅读</p>
</blockquote>

      
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              <div class="post-toc-content"><ol class="nav"><li class="nav-item nav-level-1"><a class="nav-link" href="#原生js实现电商商品图片放大镜效果"><span class="nav-number">1.</span> <span class="nav-text">原生js实现电商商品图片放大镜效果</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#相信大家逛淘宝，京东等类似电商购物平台的时候往往会看到一些图片展示的效果，例如：把鼠标放在图片上右侧会出现一个放大的预览区域，这就是所谓放大镜效果，今天就教大家用js写一个类似放大镜效果。"><span class="nav-number">1.1.</span> <span class="nav-text">相信大家逛淘宝，京东等类似电商购物平台的时候往往会看到一些图片展示的效果，例如：把鼠标放在图片上右侧会出现一个放大的预览区域，这就是所谓放大镜效果，今天就教大家用js写一个类似放大镜效果。</span></a><ol class="nav-child"><li class="nav-item nav-level-3"><a class="nav-link" href="#实现mask的移动"><span class="nav-number">1.1.1.</span> <span class="nav-text">实现mask的移动</span></a></li></ol></li></ol></li><li class="nav-item nav-level-1"><a class="nav-link" href="#show-the-code"><span class="nav-number">2.</span> <span class="nav-text">show the code</span></a><ol class="nav-child"><li class="nav-item nav-level-2"><a class="nav-link" href="#html"><span class="nav-number">2.1.</span> <span class="nav-text">html</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#css"><span class="nav-number">2.2.</span> <span class="nav-text">css</span></a></li><li class="nav-item nav-level-2"><a class="nav-link" href="#JavaScript"><span class="nav-number">2.3.</span> <span class="nav-text">JavaScript</span></a></li></ol></li></ol></div>
            

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  <script>
    // Popup Window;
    var isfetched = false;
    var isXml = true;
    // Search DB path;
    var search_path = "search.xml";
    if (search_path.length === 0) {
      search_path = "search.xml";
    } else if (/json$/i.test(search_path)) {
      isXml = false;
    }
    var path = "/" + search_path;
    // monitor main search box;

    var onPopupClose = function (e) {
      $('.popup').hide();
      $('#local-search-input').val('');
      $('.search-result-list').remove();
      $('#no-result').remove();
      $(".local-search-pop-overlay").remove();
      $('body').css('overflow', '');
    }

    function proceedsearch() {
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay"></div>')
        .css('overflow', 'hidden');
      $('.search-popup-overlay').click(onPopupClose);
      $('.popup').toggle();
      var $localSearchInput = $('#local-search-input');
      $localSearchInput.attr("autocapitalize", "none");
      $localSearchInput.attr("autocorrect", "off");
      $localSearchInput.focus();
    }

    // search function;
    var searchFunc = function(path, search_id, content_id) {
      'use strict';

      // start loading animation
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay">' +
          '<div id="search-loading-icon">' +
          '<i class="fa fa-spinner fa-pulse fa-5x fa-fw"></i>' +
          '</div>' +
          '</div>')
        .css('overflow', 'hidden');
      $("#search-loading-icon").css('margin', '20% auto 0 auto').css('text-align', 'center');

      

      $.ajax({
        url: path,
        dataType: isXml ? "xml" : "json",
        async: true,
        success: function(res) {
          // get the contents from search data
          isfetched = true;
          $('.popup').detach().appendTo('.header-inner');
          var datas = isXml ? $("entry", res).map(function() {
            return {
              title: $("title", this).text(),
              content: $("content",this).text(),
              url: $("url" , this).text()
            };
          }).get() : res;
          var input = document.getElementById(search_id);
          var resultContent = document.getElementById(content_id);
          var inputEventFunction = function() {
            var searchText = input.value.trim().toLowerCase();
            var keywords = searchText.split(/[\s\-]+/);
            if (keywords.length > 1) {
              keywords.push(searchText);
            }
            var resultItems = [];
            if (searchText.length > 0) {
              // perform local searching
              datas.forEach(function(data) {
                var isMatch = false;
                var hitCount = 0;
                var searchTextCount = 0;
                var title = data.title.trim();
                var titleInLowerCase = title.toLowerCase();
                var content = data.content.trim().replace(/<[^>]+>/g,"");
                
                var contentInLowerCase = content.toLowerCase();
                var articleUrl = decodeURIComponent(data.url).replace(/\/{2,}/g, '/');
                var indexOfTitle = [];
                var indexOfContent = [];
                // only match articles with not empty titles
                if(title != '') {
                  keywords.forEach(function(keyword) {
                    function getIndexByWord(word, text, caseSensitive) {
                      var wordLen = word.length;
                      if (wordLen === 0) {
                        return [];
                      }
                      var startPosition = 0, position = [], index = [];
                      if (!caseSensitive) {
                        text = text.toLowerCase();
                        word = word.toLowerCase();
                      }
                      while ((position = text.indexOf(word, startPosition)) > -1) {
                        index.push({position: position, word: word});
                        startPosition = position + wordLen;
                      }
                      return index;
                    }

                    indexOfTitle = indexOfTitle.concat(getIndexByWord(keyword, titleInLowerCase, false));
                    indexOfContent = indexOfContent.concat(getIndexByWord(keyword, contentInLowerCase, false));
                  });
                  if (indexOfTitle.length > 0 || indexOfContent.length > 0) {
                    isMatch = true;
                    hitCount = indexOfTitle.length + indexOfContent.length;
                  }
                }

                // show search results

                if (isMatch) {
                  // sort index by position of keyword

                  [indexOfTitle, indexOfContent].forEach(function (index) {
                    index.sort(function (itemLeft, itemRight) {
                      if (itemRight.position !== itemLeft.position) {
                        return itemRight.position - itemLeft.position;
                      } else {
                        return itemLeft.word.length - itemRight.word.length;
                      }
                    });
                  });

                  // merge hits into slices

                  function mergeIntoSlice(text, start, end, index) {
                    var item = index[index.length - 1];
                    var position = item.position;
                    var word = item.word;
                    var hits = [];
                    var searchTextCountInSlice = 0;
                    while (position + word.length <= end && index.length != 0) {
                      if (word === searchText) {
                        searchTextCountInSlice++;
                      }
                      hits.push({position: position, length: word.length});
                      var wordEnd = position + word.length;

                      // move to next position of hit

                      index.pop();
                      while (index.length != 0) {
                        item = index[index.length - 1];
                        position = item.position;
                        word = item.word;
                        if (wordEnd > position) {
                          index.pop();
                        } else {
                          break;
                        }
                      }
                    }
                    searchTextCount += searchTextCountInSlice;
                    return {
                      hits: hits,
                      start: start,
                      end: end,
                      searchTextCount: searchTextCountInSlice
                    };
                  }

                  var slicesOfTitle = [];
                  if (indexOfTitle.length != 0) {
                    slicesOfTitle.push(mergeIntoSlice(title, 0, title.length, indexOfTitle));
                  }

                  var slicesOfContent = [];
                  while (indexOfContent.length != 0) {
                    var item = indexOfContent[indexOfContent.length - 1];
                    var position = item.position;
                    var word = item.word;
                    // cut out 100 characters
                    var start = position - 20;
                    var end = position + 80;
                    if(start < 0){
                      start = 0;
                    }
                    if (end < position + word.length) {
                      end = position + word.length;
                    }
                    if(end > content.length){
                      end = content.length;
                    }
                    slicesOfContent.push(mergeIntoSlice(content, start, end, indexOfContent));
                  }

                  // sort slices in content by search text's count and hits' count

                  slicesOfContent.sort(function (sliceLeft, sliceRight) {
                    if (sliceLeft.searchTextCount !== sliceRight.searchTextCount) {
                      return sliceRight.searchTextCount - sliceLeft.searchTextCount;
                    } else if (sliceLeft.hits.length !== sliceRight.hits.length) {
                      return sliceRight.hits.length - sliceLeft.hits.length;
                    } else {
                      return sliceLeft.start - sliceRight.start;
                    }
                  });

                  // select top N slices in content

                  var upperBound = parseInt('-1');
                  if (upperBound >= 0) {
                    slicesOfContent = slicesOfContent.slice(0, upperBound);
                  }

                  // highlight title and content

                  function highlightKeyword(text, slice) {
                    var result = '';
                    var prevEnd = slice.start;
                    slice.hits.forEach(function (hit) {
                      result += text.substring(prevEnd, hit.position);
                      var end = hit.position + hit.length;
                      result += '<b class="search-keyword">' + text.substring(hit.position, end) + '</b>';
                      prevEnd = end;
                    });
                    result += text.substring(prevEnd, slice.end);
                    return result;
                  }

                  var resultItem = '';

                  if (slicesOfTitle.length != 0) {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + highlightKeyword(title, slicesOfTitle[0]) + "</a>";
                  } else {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + title + "</a>";
                  }

                  slicesOfContent.forEach(function (slice) {
                    resultItem += "<a href='" + articleUrl + "'>" +
                      "<p class=\"search-result\">" + highlightKeyword(content, slice) +
                      "...</p>" + "</a>";
                  });

                  resultItem += "</li>";
                  resultItems.push({
                    item: resultItem,
                    searchTextCount: searchTextCount,
                    hitCount: hitCount,
                    id: resultItems.length
                  });
                }
              })
            };
            if (keywords.length === 1 && keywords[0] === "") {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-search fa-5x"></i></div>'
            } else if (resultItems.length === 0) {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-frown-o fa-5x"></i></div>'
            } else {
              resultItems.sort(function (resultLeft, resultRight) {
                if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
                  return resultRight.searchTextCount - resultLeft.searchTextCount;
                } else if (resultLeft.hitCount !== resultRight.hitCount) {
                  return resultRight.hitCount - resultLeft.hitCount;
                } else {
                  return resultRight.id - resultLeft.id;
                }
              });
              var searchResultList = '<ul class=\"search-result-list\">';
              resultItems.forEach(function (result) {
                searchResultList += result.item;
              })
              searchResultList += "</ul>";
              resultContent.innerHTML = searchResultList;
            }
          }

          if ('auto' === 'auto') {
            input.addEventListener('input', inputEventFunction);
          } else {
            $('.search-icon').click(inputEventFunction);
            input.addEventListener('keypress', function (event) {
              if (event.keyCode === 13) {
                inputEventFunction();
              }
            });
          }

          // remove loading animation
          $(".local-search-pop-overlay").remove();
          $('body').css('overflow', '');

          proceedsearch();
        }
      });
    }

    // handle and trigger popup window;
    $('.popup-trigger').click(function(e) {
      e.stopPropagation();
      if (isfetched === false) {
        searchFunc(path, 'local-search-input', 'local-search-result');
      } else {
        proceedsearch();
      };
    });

    $('.popup-btn-close').click(onPopupClose);
    $('.popup').click(function(e){
      e.stopPropagation();
    });
    $(document).on('keyup', function (event) {
      var shouldDismissSearchPopup = event.which === 27 &&
        $('.search-popup').is(':visible');
      if (shouldDismissSearchPopup) {
        onPopupClose();
      }
    });
  </script>





  

  

  

  

  

  

  

  
  
  
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